"Buddy extension?"

I know I can set up a ring group to ring two extensions at once, but what if someone transfers a call to a member of a ring group, rather than the extension assigned to the ring group - with that still ring the other members of the ring group?

No, because that is a transfer to the extension not the ring group.
That is not how any phone system works otherwise it would be impossible to transfer a call to an extension.

You can use find me/ follow me for each extension with the unanswered destination being the ring group.

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